Identification of Li-Ion Battery SEI Compounds through 7Li and 13C Solid-State MAS NMR Spectroscopy and MALDI-TOF Mass Spectrometry
| Autor: | Jennifer Esbenshade, Laura A. Huff, Yet-Ming Chiang, Andrew A. Gewirth, Wenting Xing, Hadi Tavassol |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Ethylene oxide Analytical chemistry 02 engineering and technology Nuclear magnetic resonance spectroscopy Carbon-13 NMR 010402 general chemistry 021001 nanoscience & nanotechnology Mass spectrometry Electrochemistry 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Matrix-assisted laser desorption/ionization chemistry General Materials Science Dimethyl carbonate 0210 nano-technology Ethylene carbonate |
| Zdroj: | ACS Applied Materials & Interfaces. 8:371-380 |
| ISSN: | 1944-8252 1944-8244 |
| Popis: | Solid-state (7)Li and (13)C MAS NMR spectra of cycled graphitic Li-ion anodes demonstrate SEI compound formation upon lithiation that is followed by changes in the SEI upon delithiation. Solid-state (13)C DPMAS NMR shows changes in peaks associated with organic solvent compounds (ethylene carbonate and dimethyl carbonate, EC/DMC) upon electrochemical cycling due to the formation of and subsequent changes in the SEI compounds. Solid-state (13)C NMR spin-lattice (T1) relaxation time measurements of lithiated Li-ion anodes and reference poly(ethylene oxide) (PEO) powders, along with MALDI-TOF mass spectrometry results, indicate that large-molecular-weight polymers are formed in the SEI layers of the discharged anodes. MALDI-TOF MS and NMR spectroscopy results additionally indicate that delithiated anodes exhibit a larger number of SEI products than is found in lithiated anodes. |
| Databáze: | OpenAIRE |
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